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Journal article
Vergence Endurance Test: A Pilot Study for a Concussion Biomarker
Journal of neurotrauma, v 36(14), pp 2200-2212
15 Jul 2019
PMID: 30829134
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The Vergence Endurance Test (VET), a quantitative and objective eye movement assessment, was utilized to differentiate control from concussed subjects. Nine symptomatic concussed (2 male; 30.8 +/- 11 years) and 9 asymptomatic control (6 male; 25.1 +/- 1.4 years) subjects participated in the VET. Symmetrical disparity vergence step targets were presented with and without visual distractors. A masked data analyst measured vergence latency, peak velocity, response amplitude, settling time, and the percentage of trials which contained blinks. A Binocular Precision Index (BPI) and a Binocular Accuracy Index (BAI) were calculated to quantify the changes that occur in the vergence parameters over the duration of the VET. Convergence and divergence peak velocity, divergence response amplitude, the percentage of trials that contained blinks during the transient portion of the response, and the BAI were significantly (p < 0.05) different between the concussed and the control subjects. For these parameters, the BAI and divergence response amplitude yielded the greatest accuracy, 78%, in their ability to discriminate between the groups. The VET objectively measures the change in vergence performance over time and shows promise as a method to diagnose a concussion. Future studies will determine whether the VET can be used to assess the extent of natural recovery and the effectiveness of therapeutic interventions.
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Details
- Title
- Vergence Endurance Test: A Pilot Study for a Concussion Biomarker
- Creators
- Chang Yaramothu - New Jersey Institute of TechnologyLynn D. Greenspan - Salus UniversityMitchell Scheiman - Salus UniversityTara L. Alvarez - New Jersey Institute of Technology
- Publication Details
- Journal of neurotrauma, v 36(14), pp 2200-2212
- Publisher
- Mary Ann Liebert, Inc
- Number of pages
- 13
- Grant note
- CBET 1428425 / NSF MRI; National Science Foundation (NSF); NSF - Office of the Director (OD) 1R01EY023261 / NIH; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Pennsylvania College of Optometry (PCO)
- Web of Science ID
- WOS:000462599700001
- Scopus ID
- 2-s2.0-85068533767
- Other Identifier
- 991021900021104721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Clinical Neurology
- Critical Care Medicine
- Neurosciences